Air enters the compressor of a Brayton refrigeration cycle at 100 kPa, 260 K, and is compressed adiabatically to 300 kPa. Air enters the turbine at 300 kPa, 300 K, and expands adiabatically to 100 kPa. For the cycle, assuming the compressor and turbine isentropic efficiencies are both 100%, determine: (a) The net work per unit mass of air flow [15 kJ/kg] (b) The coefficient of performance [2.7]

T5.1

pls answer both questions thankyou

Air at 1 bar, 27 °C, with a volumetric flow rate of 40 m³/min enters the non-mixing counterflow heat exchanger part of an air-conditioning system. This air exits the heat exchanger at 0.95 bar and 17 °C. The cooling of this air is done by a stream of refrigerant R-134a that enters the heat exchanger at 5 bar with a quality of 0.3 and exits at 5 bar and 20 °C. Determine the overall rate of entropy production during this process, in kW. The overall heat exchanger is insulated. The operation is steady state, and the effects of potential and kinetic energy are negligible.